org.aopalliance.intercept.FieldInterceptor Maven / Gradle / Ivy
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package org.aopalliance.intercept;
/**
* 拦截目标对象的域访问操作.
*
* 用户应该实现{@link #set(FieldAccess)}方法和
* {@link #get(FieldAccess)}来修改原始行为.
* 例如,以下类实现了跟踪拦截器(跟踪被拦截域的访问):
*
* class TracingInterceptor implements FieldInterceptor {
*
* Object set(FieldAccess fa) throws Throwable {
* System.out.println("field "+fa.getField()+" is set with value "+
* fa.getValueToSet());
* Object ret=fa.proceed();
* System.out.println("field "+fa.getField()+" was set to value "+ret);
* return ret;
* }
*
* Object get(FieldAccess fa) throws Throwable {
* System.out.println("field "+fa.getField()+" is about to be read");
* Object ret=fa.proceed();
* System.out.println("field "+fa.getField()+" was read; value is "+ret);
* return ret;
* }
* }
*
*
* @author daniel lee
*/
public interface FieldInterceptor extends Interceptor {
/**
* 在field获取前、后实现操作.
* 优雅的实现会调用{@link Joinpoint#proceed()}(内部封装本方法)来实现.
*
* @param fieldRead 域READ相关的连接点
* @return 域获取{@link Joinpoint#proceed()}的结果,可能被拦截器所拦截.
* @throws Throwable 如果拦截器或目标对象抛出异常.
*/
Object get(FieldAccess fieldRead) throws Throwable;
/**
* 在field设置前、后实现操作.
* 优雅的实现会调用{@link Joinpoint#proceed()}(内部封装本方法)来实现.
*
* @param fieldWrite 域WRITE相关的连接点
* @return 域设置{@link Joinpoint#proceed()}的结果,可能被拦截器所拦截.
* @throws Throwable 如果拦截器或目标对象抛出异常.
*/
Object set(FieldAccess fieldWrite) throws Throwable;
}